[libcalamares] Use shared_ptr instead of unique_ptr

The value inside a unique_ptr can't be opaque, it needs to be known
at any site where the pointer may be deleted. shared_ptr does not
have that (deletion is part of the shared_ptr object, which is larger
than the unique_ptr) and so can be used for opaque deletions.

src/libcalamares/partition/AutoMount.cpp

@@ -67,10 +67,10 @@ querySolidAutoMount( QDBusConnection& dbus, AutoMountInfo& info )
     }
 }
 
-std::unique_ptr< AutoMountInfo >
+std::shared_ptr< AutoMountInfo >
 automountDisable( bool disable )
 {
-    auto u = std::make_unique< AutoMountInfo >();
+    auto u = std::make_shared< AutoMountInfo >();
     QDBusConnection dbus = QDBusConnection::sessionBus();
     querySolidAutoMount( dbus, *u );
     enableSolidAutoMount( dbus, !disable );
@@ -79,7 +79,7 @@ automountDisable( bool disable )
 
 
 void
-automountRestore( std::unique_ptr< AutoMountInfo >&& t )
+automountRestore( std::shared_ptr< AutoMountInfo >&& t )
 {
     QDBusConnection dbus = QDBusConnection::sessionBus();
     enableSolidAutoMount( dbus, t->wasSolidModuleAutoLoaded );

src/libcalamares/partition/AutoMount.h

@@ -36,14 +36,14 @@ struct AutoMountInfo;
  * Returns an opaque structure which can be passed to automountRestore()
  * to return the system to the previously-configured automount settings.
  */
-DLLEXPORT std::unique_ptr< AutoMountInfo > automountDisable( bool disable = true );
+DLLEXPORT std::shared_ptr< AutoMountInfo > automountDisable( bool disable = true );
 
 /** @brief Restore automount settings
  *
  * Pass the value returned from automountDisable() to restore the
  * previous settings.
  */
-DLLEXPORT void automountRestore( std::unique_ptr< AutoMountInfo >&& t );
+DLLEXPORT void automountRestore( std::shared_ptr< AutoMountInfo >&& t );
 
 }  // namespace Partition
 }  // namespace CalamaresUtils